Fermentation bung



FIG. 1 is a bottom and side perspective view of a fermentation bung showing my new design;

FIG. 2 is a top and side perspective view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a view taken from line 6—6 of FIG. 3; and,

FIG. 7 is a view taken from line 7—7 of FIG. 3. 

The ornamental design for a fermentation bung, as shown and described. 